Hi Octonion.
Welcome to our Mattress Forum! 
Generally, you can just perform a Forum Search and type a “key term” any city or area you would be closer to and consider driving or any other area and see what other businesses have been discussed in that region which may be helpful to you, but from your questions and comments I think you have a bit more legwork to do.
[quote]1) I am looking for a spring or wool mattress. Latex mattress although feels good, it heats up after sometime and is never going to be as cool as a coil mattress.
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As temperature regulation seems to be an issue for you …. Here is some information that can help. While the upper layers of a mattress are the most significant part of temperature and moisture regulation … you are correct that deeper support components that allow more airflow can also have an effect and so innersprings will also tend to sleep cooler than foam support cores as long as the air can ventilate to the outside of the mattress. Generally, the materials, layers, and components of a sleeping system that are closer to your skin will have a bigger effect on airflow, moisture transport, and temperature regulation than materials, layers, and components that are further away from your skin.
While not a complete list, there are quite a few manufacturers who produce mattresses without foams, and there is a listing of them in post #4 here, along with some notes on these types of products. It should be enough to get you started on your search. Also, in the topper thread here there are some MicroCoil toppers listed as well that you may wish to consider which would allow for most breathability. Additionally, there is more about the many variables that can affect the sleeping temperature of a mattress or sleeping system in post #2 here that can help you choose the types of materials and components that are most likely to keep you in a comfortable temperature range and keep in mind that this will also depend on how many different factors interact. There is more about this in post #2 here .
Wool is among the best temperature regulating materials but I would also keep in mind that it regulates temperature in both directions (it’s used in the desert and also in cold climates because of this) so while it may not feel “cool” … it generally doesn’t feel “hot” either and it also helps to regulate moisture (which can trap heat) and reduce the perception of temperature that comes from higher humidity levels (similar to how temperatures feel cooler on less humid days than they do on more humid days). Wool may also reduce the amount of heat that reaches the memory foam so it can also firm up the memory foam or at least slow down the time it takes to become softer with body temperature.
While TMU can certainly help with “how” to choose … It’s not possible to make specific suggestions or recommendations for either a mattress, manufacturers/retailers, or combinations of materials or components because the first “rule” of mattress shopping is to always remember that you are the only one that can feel what you feel on a mattress and there are too many unknowns, variables, and personal preferences involved that are unique to each person to use a formula or for anyone to be able to predict or make a specific suggestion or recommendation about which mattress or combination of materials and components or which type of mattress would be the best “match” for you in terms of “comfort”, firmness, or PPP or how a mattress will “feel” to you or compare to another mattress based on specs (either yours or a mattress), sleeping positions, health conditions, or “theory at a distance” that can possibly be more reliable than your own careful testing (hopefully using the testing guidelines in step 4 of the tutorial) or your own personal sleeping experience (see post #2 here).
I’m not sure what you’ve read since you found the site but just in case you haven’t read it yet … the first place to start your research is the mattress shopping tutorial here which includes all the basic information, steps, and guidelines that can help you make the best possible choice … and perhaps more importantly know how and why to avoid the worst ones.
Two of the most important links in the tutorial that I would especially make sure you’ve read are post #2 here which has more about the different ways to choose a suitable mattress (either locally or online) that is the best “match” for you in terms of “comfort”, firmness, and PPP that can help you assess and minimize the risks of making a choice that doesn’t turn out as well as you hoped for and post #13 here which has more about the most important parts of the “value” of a mattress purchase which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability (how well you will sleep), durability (how long you will sleep well), and the overall value of a mattress compared to your other finalists based on all the parts of your personal value equation that are most important to you (including the price of course and the options you have available after a purchase if your choice doesn’t turn out as well as you hoped for).
Whatever business you’re considering, I would always confirm that any retailer or manufacturer that you wish to visit is completely transparent (see this article) and also make sure that any mattress that you are considering meets the Post #13 quality/value guidelines here.
Once you have a chance to narrow down your options please let me or any of our Expert Members know and if you have more specific questions will be happy to assist you.
Phoenix